Engine General Information and Diagnosis: 1A-56
Excessive hydrocarbon
(HC) emission or carbon
monoxide (CO)
Faulty spark plug
“Spark Plug Inspection: in Section 1H”
Leaky or disconnected high-tension cord
(for M16 engine)
“High-Tension Cord Removal and Installation
(For M16 Engine): in Section 1H”
Faulty ignition coil with ignitor
“Ignition Coil Assembly (Including ignitor)
Inspection: in Section 1H”
Low compression
“Compression Check: For J20 Engine in
Section 1D” or “Compression Check: For
M16A Engine with VVT in Section 1D”
Lead contamination of three way
catalytic converter
Check for absence of filler neck restrictor.
Faulty evaporative emission control
system
“EVAP Canister Purge Inspection: in Section
1B”
Fuel pressure out of specification
“Fuel Pressure Check: ”
Closed loop system (A/F feedback
compensation) fails (Faulty TP sensor,
Poor performance of ECT sensor or
MAF sensor)
“Electric Throttle Body Assembly On-Vehicle
Inspection: in Section 1C”, “Engine Coolant
Temperature (ECT) Sensor Inspection: in
Section 1C” or “Mass Air Flow (MAF) and
Intake Air Temperature (IAT) Sensor
Inspection: in Section 1C”
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection: in Section 1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection: in Section 1C”
Faulty injector(s)
“Fuel Injector Circuit Check: ”
Faulty ECM
Engine not at normal operating
temperature
Clogged air cleaner
“Air Cleaner Filter Inspection and Cleaning:
For J20 Engine in Section 1D” or “Air Cleaner
Filter Inspection and Cleaning: For M16A
Engine with VVT in Section 1D”
Vacuum leaks
“Engine Vacuum Check: For J20 Engine in
Section 1D” or “Engine Vacuum Check: For
M16A Engine with VVT in Section 1D”
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Excessive nitrogen
oxides (NOx) emission
Improper ignition timing
“Ignition Timing Inspection: in Section 1H”
Lead contamination of catalytic
converter
Check for absence of filler neck restrictor.
Faulty EGR system
“EGR System Inspection: in Section 1B”
Fuel pressure out of specification
“Fuel Pressure Check: ”
Closed loop system (A/F feedback
compensation) fails (Faulty TP sensor,
Poor performance of ECT sensor or
MAF sensor)
“Electric Throttle Body Assembly On-Vehicle
Inspection: in Section 1C”, “Engine Coolant
Temperature (ECT) Sensor Inspection: in
Section 1C” or “Mass Air Flow (MAF) and
Intake Air Temperature (IAT) Sensor
Inspection: in Section 1C”
Faulty electric throttle body assembly
“Electric Throttle Body Assembly On-Vehicle
Inspection: in Section 1C”
Faulty accelerator pedal position (APP)
sensor assembly
“Accelerator Pedal Position (APP) Sensor
Assembly Inspection: in Section 1C”
Faulty injector(s)
“Fuel Injector Circuit Check: ”
Faulty ECM
Camshaft position control (VVT) system
out of order (for M16 engine)
“Oil Control Valve Inspection: For M16A
Engine with VVT in Section 1D”
Condition
Possible cause
Correction / Reference Item
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